LM2574HVM-12/NOPB

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LM2574HVM-12/NOPB Application Field and Working Principle

The LM2574HVM-12/NOPB is a monolithic integrated circuit belonging to the Power Management IC (PMIC) family of Voltage Regulators, specifically DC DC Switching Regulators. It is used to produce a reliable and precise output voltage, despite inevitable fluctuations in the device’s input voltage.

It belongs to the LM2574 series of regulators, which are designed to operate with minimal components and without power transistors, as thanks to its pulse width modulation (PWM) control circuit, its output can be regulated accurately over a wide input voltage range. The specific HVM-12 variant allows the device to output up to 12 volts from voltages ranging from 4.75 volts via a regular input voltage or from 4.2 volts when an external logic supply voltage is present.

The LM2574 offers protection for the device and the system, thanks to its protection during the internal soft-start and undervoltage lockout (UVLO) as well as during short-circuit, overcurrent and over temperature.

The internal oscillator is designed to operate with a fixed frequency of 100 kHz for the buck converter. This allows it to easily switch between a continuous and discontinuous mode of operation.

The thermal protection circuitry cleals Un-clamped Inductive Switching (UIS) fault conditions and Limits peak currents. During operation, an additional voltage feedback can be taken from the output in order to improve system accuracy and power efficiency.

The device is also capable of synchronizing with an external clock, with operating frequencies between 750kHz and 950kHz. As voltage scaling is only required when the output load increases drastically after the device has begun regulating voltage, the compensator (error) amplifier is designed to reduce output transients quickly.

Additionally, the monolithic construction of the LM2574HVM-12/NOPB provides considerable advantages when it comes to a range of specifications, from low ground current and high brightness LED display applications to motor speed control systems.

To summarise, the LM2574HVM-12/NOPB belongs to the Power Management IC (PMIC) family of Voltage Regulators, specifically DC DC Switching Regulators. It is used to produce a reliable and precise output voltage, with a wide input voltage range and without the need of power transistors. It provides protection for both the device and the system, and is also capable of synchronizing with an external clock. Its monolithic construction also makes it ideal for a range of applications, from low ground current and high brightness LED display applications to motor speed control systems.

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